As you may already be aware of, chao will go through different stages of their life. Once they hatch out of their egg, they are known as child chao. This stage usually lasts for approximately 3 hours, but you can speed up the process by feeding your chao fruit. During this time, the child chao's shape and color will change based on the animals you give it. Eventually, your chao will form a light blue tear-shaped cocoon with a yellow tip. This means that your chao is now an adult. This stage will last the longest, approximately 5 chao years (1 chao year = 3 hours). Based on your chao's happiness stat, it will either die or reincarnate. The coccoon will be pink if it's reincarnating, or it will be white if it is dying. Remember, once chao die, they are permanently gone, so make sure you don't abuse your chao.